Question

food webs and food chains worksheet
1 look at this food chain.
lettuce greenfly ladybird thrush cat
a what does the arrow mean in a food chain?
b name the producer in the food chain
c name the third trophic level in the food chain.
d name the tertiary consumer in the food chain.
e what is the ultimate source of energy that drives the food chain?

1. look at these food chains.

grass → slug → thrush → cat
grass → slug → fox
grass → rabbit → fox
grass → rabbit → cat
a use the food chains to help you fill in the
arrows on this food web. one has been
added for you.
use the food web to help you answer these questions.
b name the producer in this food web.
c name a consumer in this food web.
d what eats rabbits?
e what does a fox eat?

Explanation:

For Section 1:

a. Arrows in food chains show the direction of energy flow (who is eaten by whom).
b. Producers make their own food via photosynthesis; lettuce is a plant producer.
c. Trophic levels start at 1 (producer): 1=lettuce, 2=greenfly, 3=ladybird.
d. Tertiary consumers eat secondary consumers: thrush (secondary) is eaten by cat? No, tertiary is the 4th level: 1=producer, 2=primary consumer, 3=secondary, 4=tertiary (thrush).
e. All food chains get energy from sunlight (used by producers for photosynthesis).

For Section 2:

a. Arrows point from prey to predator: grass → slug, grass → rabbit; slug → fox, slug → thrush; thrush → cat; rabbit → fox, rabbit → cat.
b. The only producer (plant) in the web is grass.
c. Any animal in the web is a consumer (eats other organisms).
d. Check the food chains to see which animals eat rabbits.
e. Check the food chains to see what prey the fox eats.

Answer:

Section 1

a. It shows energy flow (who eats whom)
b. lettuce
c. ladybird
d. thrush
e. The Sun (sunlight)

Section 2

a.

• grass → slug
• grass → rabbit
• slug → fox
• thrush → cat
• rabbit → fox
• rabbit → cat

b. grass
c. slug (or rabbit, thrush, fox, cat)
d. fox and cat
e. slugs and rabbits